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The subjunctive is a mood which expresses actions or ideas which have an element of doubt or subjectivity about them. Examples include emotions, will/wanting, possibility, necessity and opinions/judgem...

A depression is a weather system of low pressure which moves across the British Isles from west to east. It involves two air masses which meet at a front. The air masses are tropical maritime which bri...

We have two functions multiplied together: x and cos(x).

Therefore we have to use the product rule.

First differentiate x and leave cos(x) untouched, so we get 1(cos(x))=cos...